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1//! Methods for lowering the HIR to types. There are two main cases here:
2//!
3//! - Lowering a type reference like `&usize` or `Option<foo::bar::Baz>` to a
4//! type: The entry point for this is `Ty::from_hir`.
5//! - Building the type for an item: This happens through the `type_for_def` query.
6//!
7//! This usually involves resolving names, collecting generic arguments etc.
8use std::iter;
9use std::sync::Arc;
10
11use hir_def::{
12 builtin_type::BuiltinType,
13 generics::WherePredicate,
14 path::{GenericArg, Path, PathSegment},
15 resolver::{HasResolver, Resolver, TypeNs},
16 type_ref::{TypeBound, TypeRef},
17 AdtId, AstItemDef, ConstId, EnumId, EnumVariantId, FunctionId, GenericDefId, HasModule,
18 LocalStructFieldId, Lookup, StaticId, StructId, TraitId, TypeAliasId, UnionId, VariantId,
19};
20use ra_arena::map::ArenaMap;
21use ra_db::CrateId;
22
23use super::{
24 FnSig, GenericPredicate, ProjectionPredicate, ProjectionTy, Substs, TraitEnvironment, TraitRef,
25 Ty, TypeCtor, TypeWalk,
26};
27use crate::{
28 db::HirDatabase,
29 ty::{
30 primitive::{FloatTy, IntTy},
31 utils::{all_super_traits, associated_type_by_name_including_super_traits, variant_data},
32 },
33 util::make_mut_slice,
34 ImplBlock, Trait,
35};
36
37impl Ty {
38 pub(crate) fn from_hir(db: &impl HirDatabase, resolver: &Resolver, type_ref: &TypeRef) -> Self {
39 match type_ref {
40 TypeRef::Never => Ty::simple(TypeCtor::Never),
41 TypeRef::Tuple(inner) => {
42 let inner_tys: Arc<[Ty]> =
43 inner.iter().map(|tr| Ty::from_hir(db, resolver, tr)).collect();
44 Ty::apply(
45 TypeCtor::Tuple { cardinality: inner_tys.len() as u16 },
46 Substs(inner_tys),
47 )
48 }
49 TypeRef::Path(path) => Ty::from_hir_path(db, resolver, path),
50 TypeRef::RawPtr(inner, mutability) => {
51 let inner_ty = Ty::from_hir(db, resolver, inner);
52 Ty::apply_one(TypeCtor::RawPtr(*mutability), inner_ty)
53 }
54 TypeRef::Array(inner) => {
55 let inner_ty = Ty::from_hir(db, resolver, inner);
56 Ty::apply_one(TypeCtor::Array, inner_ty)
57 }
58 TypeRef::Slice(inner) => {
59 let inner_ty = Ty::from_hir(db, resolver, inner);
60 Ty::apply_one(TypeCtor::Slice, inner_ty)
61 }
62 TypeRef::Reference(inner, mutability) => {
63 let inner_ty = Ty::from_hir(db, resolver, inner);
64 Ty::apply_one(TypeCtor::Ref(*mutability), inner_ty)
65 }
66 TypeRef::Placeholder => Ty::Unknown,
67 TypeRef::Fn(params) => {
68 let sig = Substs(params.iter().map(|tr| Ty::from_hir(db, resolver, tr)).collect());
69 Ty::apply(TypeCtor::FnPtr { num_args: sig.len() as u16 - 1 }, sig)
70 }
71 TypeRef::DynTrait(bounds) => {
72 let self_ty = Ty::Bound(0);
73 let predicates = bounds
74 .iter()
75 .flat_map(|b| {
76 GenericPredicate::from_type_bound(db, resolver, b, self_ty.clone())
77 })
78 .collect();
79 Ty::Dyn(predicates)
80 }
81 TypeRef::ImplTrait(bounds) => {
82 let self_ty = Ty::Bound(0);
83 let predicates = bounds
84 .iter()
85 .flat_map(|b| {
86 GenericPredicate::from_type_bound(db, resolver, b, self_ty.clone())
87 })
88 .collect();
89 Ty::Opaque(predicates)
90 }
91 TypeRef::Error => Ty::Unknown,
92 }
93 }
94
95 /// This is only for `generic_predicates_for_param`, where we can't just
96 /// lower the self types of the predicates since that could lead to cycles.
97 /// So we just check here if the `type_ref` resolves to a generic param, and which.
98 fn from_hir_only_param(
99 db: &impl HirDatabase,
100 resolver: &Resolver,
101 type_ref: &TypeRef,
102 ) -> Option<u32> {
103 let path = match type_ref {
104 TypeRef::Path(path) => path,
105 _ => return None,
106 };
107 if let crate::PathKind::Type(_) = &path.kind {
108 return None;
109 }
110 if path.segments.len() > 1 {
111 return None;
112 }
113 let resolution = match resolver.resolve_path_in_type_ns(db, path) {
114 Some((it, None)) => it,
115 _ => return None,
116 };
117 if let TypeNs::GenericParam(idx) = resolution {
118 Some(idx)
119 } else {
120 None
121 }
122 }
123
124 pub(crate) fn from_type_relative_path(
125 db: &impl HirDatabase,
126 resolver: &Resolver,
127 ty: Ty,
128 remaining_segments: &[PathSegment],
129 ) -> Ty {
130 if remaining_segments.len() == 1 {
131 // resolve unselected assoc types
132 let segment = &remaining_segments[0];
133 Ty::select_associated_type(db, resolver, ty, segment)
134 } else if remaining_segments.len() > 1 {
135 // FIXME report error (ambiguous associated type)
136 Ty::Unknown
137 } else {
138 ty
139 }
140 }
141
142 pub(crate) fn from_partly_resolved_hir_path(
143 db: &impl HirDatabase,
144 resolver: &Resolver,
145 resolution: TypeNs,
146 resolved_segment: &PathSegment,
147 remaining_segments: &[PathSegment],
148 ) -> Ty {
149 let ty = match resolution {
150 TypeNs::TraitId(trait_) => {
151 let trait_ref = TraitRef::from_resolved_path(
152 db,
153 resolver,
154 trait_.into(),
155 resolved_segment,
156 None,
157 );
158 return if remaining_segments.len() == 1 {
159 let segment = &remaining_segments[0];
160 let associated_ty = associated_type_by_name_including_super_traits(
161 db,
162 trait_ref.trait_,
163 &segment.name,
164 );
165 match associated_ty {
166 Some(associated_ty) => {
167 // FIXME handle type parameters on the segment
168 Ty::Projection(ProjectionTy {
169 associated_ty,
170 parameters: trait_ref.substs,
171 })
172 }
173 None => {
174 // FIXME: report error (associated type not found)
175 Ty::Unknown
176 }
177 }
178 } else if remaining_segments.len() > 1 {
179 // FIXME report error (ambiguous associated type)
180 Ty::Unknown
181 } else {
182 Ty::Dyn(Arc::new([GenericPredicate::Implemented(trait_ref)]))
183 };
184 }
185 TypeNs::GenericParam(idx) => {
186 // FIXME: maybe return name in resolution?
187 let name = resolved_segment.name.clone();
188 Ty::Param { idx, name }
189 }
190 TypeNs::SelfType(impl_block) => ImplBlock::from(impl_block).target_ty(db),
191 TypeNs::AdtSelfType(adt) => db.ty(adt.into()),
192
193 TypeNs::AdtId(it) => Ty::from_hir_path_inner(db, resolver, resolved_segment, it.into()),
194 TypeNs::BuiltinType(it) => {
195 Ty::from_hir_path_inner(db, resolver, resolved_segment, it.into())
196 }
197 TypeNs::TypeAliasId(it) => {
198 Ty::from_hir_path_inner(db, resolver, resolved_segment, it.into())
199 }
200 // FIXME: report error
201 TypeNs::EnumVariantId(_) => return Ty::Unknown,
202 };
203
204 Ty::from_type_relative_path(db, resolver, ty, remaining_segments)
205 }
206
207 pub(crate) fn from_hir_path(db: &impl HirDatabase, resolver: &Resolver, path: &Path) -> Ty {
208 // Resolve the path (in type namespace)
209 if let crate::PathKind::Type(type_ref) = &path.kind {
210 let ty = Ty::from_hir(db, resolver, &type_ref);
211 let remaining_segments = &path.segments[..];
212 return Ty::from_type_relative_path(db, resolver, ty, remaining_segments);
213 }
214 let (resolution, remaining_index) = match resolver.resolve_path_in_type_ns(db, path) {
215 Some(it) => it,
216 None => return Ty::Unknown,
217 };
218 let (resolved_segment, remaining_segments) = match remaining_index {
219 None => (
220 path.segments.last().expect("resolved path has at least one element"),
221 &[] as &[PathSegment],
222 ),
223 Some(i) => (&path.segments[i - 1], &path.segments[i..]),
224 };
225 Ty::from_partly_resolved_hir_path(
226 db,
227 resolver,
228 resolution,
229 resolved_segment,
230 remaining_segments,
231 )
232 }
233
234 fn select_associated_type(
235 db: &impl HirDatabase,
236 resolver: &Resolver,
237 self_ty: Ty,
238 segment: &PathSegment,
239 ) -> Ty {
240 let param_idx = match self_ty {
241 Ty::Param { idx, .. } => idx,
242 _ => return Ty::Unknown, // Error: Ambiguous associated type
243 };
244 let def = match resolver.generic_def() {
245 Some(def) => def,
246 None => return Ty::Unknown, // this can't actually happen
247 };
248 let predicates = db.generic_predicates_for_param(def.into(), param_idx);
249 let traits_from_env = predicates.iter().filter_map(|pred| match pred {
250 GenericPredicate::Implemented(tr) if tr.self_ty() == &self_ty => Some(tr.trait_),
251 _ => None,
252 });
253 let traits = traits_from_env.flat_map(|t| all_super_traits(db, t)).map(Trait::from);
254 for t in traits {
255 if let Some(associated_ty) = db.trait_data(t.id).associated_type_by_name(&segment.name)
256 {
257 let substs = Substs::build_for_def(db, t.id)
258 .push(self_ty.clone())
259 .fill_with_unknown()
260 .build();
261 // FIXME handle type parameters on the segment
262 return Ty::Projection(ProjectionTy { associated_ty, parameters: substs });
263 }
264 }
265 Ty::Unknown
266 }
267
268 fn from_hir_path_inner(
269 db: &impl HirDatabase,
270 resolver: &Resolver,
271 segment: &PathSegment,
272 typable: TyDefId,
273 ) -> Ty {
274 let generic_def = match typable {
275 TyDefId::BuiltinType(_) => None,
276 TyDefId::AdtId(it) => Some(it.into()),
277 TyDefId::TypeAliasId(it) => Some(it.into()),
278 };
279 let substs = substs_from_path_segment(db, resolver, segment, generic_def, false);
280 db.ty(typable).subst(&substs)
281 }
282
283 /// Collect generic arguments from a path into a `Substs`. See also
284 /// `create_substs_for_ast_path` and `def_to_ty` in rustc.
285 pub(super) fn substs_from_path(
286 db: &impl HirDatabase,
287 resolver: &Resolver,
288 path: &Path,
289 // Note that we don't call `db.value_type(resolved)` here,
290 // `ValueTyDefId` is just a convenient way to pass generics and
291 // special-case enum variants
292 resolved: ValueTyDefId,
293 ) -> Substs {
294 let last = path.segments.last().expect("path should have at least one segment");
295 let (segment, generic_def) = match resolved {
296 ValueTyDefId::FunctionId(it) => (last, Some(it.into())),
297 ValueTyDefId::StructId(it) => (last, Some(it.into())),
298 ValueTyDefId::ConstId(it) => (last, Some(it.into())),
299 ValueTyDefId::StaticId(_) => (last, None),
300 ValueTyDefId::EnumVariantId(var) => {
301 // the generic args for an enum variant may be either specified
302 // on the segment referring to the enum, or on the segment
303 // referring to the variant. So `Option::<T>::None` and
304 // `Option::None::<T>` are both allowed (though the former is
305 // preferred). See also `def_ids_for_path_segments` in rustc.
306 let len = path.segments.len();
307 let segment = if len >= 2 && path.segments[len - 2].args_and_bindings.is_some() {
308 // Option::<T>::None
309 &path.segments[len - 2]
310 } else {
311 // Option::None::<T>
312 last
313 };
314 (segment, Some(var.parent.into()))
315 }
316 };
317 substs_from_path_segment(db, resolver, segment, generic_def, false)
318 }
319}
320
321pub(super) fn substs_from_path_segment(
322 db: &impl HirDatabase,
323 resolver: &Resolver,
324 segment: &PathSegment,
325 def_generic: Option<GenericDefId>,
326 add_self_param: bool,
327) -> Substs {
328 let mut substs = Vec::new();
329 let def_generics = def_generic.map(|def| db.generic_params(def.into()));
330
331 let (parent_param_count, param_count) =
332 def_generics.map_or((0, 0), |g| (g.count_parent_params(), g.params.len()));
333 substs.extend(iter::repeat(Ty::Unknown).take(parent_param_count));
334 if add_self_param {
335 // FIXME this add_self_param argument is kind of a hack: Traits have the
336 // Self type as an implicit first type parameter, but it can't be
337 // actually provided in the type arguments
338 // (well, actually sometimes it can, in the form of type-relative paths: `<Foo as Default>::default()`)
339 substs.push(Ty::Unknown);
340 }
341 if let Some(generic_args) = &segment.args_and_bindings {
342 // if args are provided, it should be all of them, but we can't rely on that
343 let self_param_correction = if add_self_param { 1 } else { 0 };
344 let param_count = param_count - self_param_correction;
345 for arg in generic_args.args.iter().take(param_count) {
346 match arg {
347 GenericArg::Type(type_ref) => {
348 let ty = Ty::from_hir(db, resolver, type_ref);
349 substs.push(ty);
350 }
351 }
352 }
353 }
354 // add placeholders for args that were not provided
355 let supplied_params = substs.len();
356 for _ in supplied_params..parent_param_count + param_count {
357 substs.push(Ty::Unknown);
358 }
359 assert_eq!(substs.len(), parent_param_count + param_count);
360
361 // handle defaults
362 if let Some(def_generic) = def_generic {
363 let default_substs = db.generic_defaults(def_generic.into());
364 assert_eq!(substs.len(), default_substs.len());
365
366 for (i, default_ty) in default_substs.iter().enumerate() {
367 if substs[i] == Ty::Unknown {
368 substs[i] = default_ty.clone();
369 }
370 }
371 }
372
373 Substs(substs.into())
374}
375
376impl TraitRef {
377 pub(crate) fn from_path(
378 db: &impl HirDatabase,
379 resolver: &Resolver,
380 path: &Path,
381 explicit_self_ty: Option<Ty>,
382 ) -> Option<Self> {
383 let resolved = match resolver.resolve_path_in_type_ns_fully(db, &path)? {
384 TypeNs::TraitId(tr) => tr,
385 _ => return None,
386 };
387 let segment = path.segments.last().expect("path should have at least one segment");
388 Some(TraitRef::from_resolved_path(db, resolver, resolved.into(), segment, explicit_self_ty))
389 }
390
391 pub(super) fn from_resolved_path(
392 db: &impl HirDatabase,
393 resolver: &Resolver,
394 resolved: Trait,
395 segment: &PathSegment,
396 explicit_self_ty: Option<Ty>,
397 ) -> Self {
398 let mut substs = TraitRef::substs_from_path(db, resolver, segment, resolved);
399 if let Some(self_ty) = explicit_self_ty {
400 make_mut_slice(&mut substs.0)[0] = self_ty;
401 }
402 TraitRef { trait_: resolved.id, substs }
403 }
404
405 pub(crate) fn from_hir(
406 db: &impl HirDatabase,
407 resolver: &Resolver,
408 type_ref: &TypeRef,
409 explicit_self_ty: Option<Ty>,
410 ) -> Option<Self> {
411 let path = match type_ref {
412 TypeRef::Path(path) => path,
413 _ => return None,
414 };
415 TraitRef::from_path(db, resolver, path, explicit_self_ty)
416 }
417
418 fn substs_from_path(
419 db: &impl HirDatabase,
420 resolver: &Resolver,
421 segment: &PathSegment,
422 resolved: Trait,
423 ) -> Substs {
424 let has_self_param =
425 segment.args_and_bindings.as_ref().map(|a| a.has_self_type).unwrap_or(false);
426 substs_from_path_segment(db, resolver, segment, Some(resolved.id.into()), !has_self_param)
427 }
428
429 pub(crate) fn for_trait(db: &impl HirDatabase, trait_: TraitId) -> TraitRef {
430 let substs = Substs::identity(&db.generic_params(trait_.into()));
431 TraitRef { trait_, substs }
432 }
433
434 pub(crate) fn from_type_bound(
435 db: &impl HirDatabase,
436 resolver: &Resolver,
437 bound: &TypeBound,
438 self_ty: Ty,
439 ) -> Option<TraitRef> {
440 match bound {
441 TypeBound::Path(path) => TraitRef::from_path(db, resolver, path, Some(self_ty)),
442 TypeBound::Error => None,
443 }
444 }
445}
446
447impl GenericPredicate {
448 pub(crate) fn from_where_predicate<'a>(
449 db: &'a impl HirDatabase,
450 resolver: &'a Resolver,
451 where_predicate: &'a WherePredicate,
452 ) -> impl Iterator<Item = GenericPredicate> + 'a {
453 let self_ty = Ty::from_hir(db, resolver, &where_predicate.type_ref);
454 GenericPredicate::from_type_bound(db, resolver, &where_predicate.bound, self_ty)
455 }
456
457 pub(crate) fn from_type_bound<'a>(
458 db: &'a impl HirDatabase,
459 resolver: &'a Resolver,
460 bound: &'a TypeBound,
461 self_ty: Ty,
462 ) -> impl Iterator<Item = GenericPredicate> + 'a {
463 let trait_ref = TraitRef::from_type_bound(db, &resolver, bound, self_ty);
464 iter::once(trait_ref.clone().map_or(GenericPredicate::Error, GenericPredicate::Implemented))
465 .chain(
466 trait_ref.into_iter().flat_map(move |tr| {
467 assoc_type_bindings_from_type_bound(db, resolver, bound, tr)
468 }),
469 )
470 }
471}
472
473fn assoc_type_bindings_from_type_bound<'a>(
474 db: &'a impl HirDatabase,
475 resolver: &'a Resolver,
476 bound: &'a TypeBound,
477 trait_ref: TraitRef,
478) -> impl Iterator<Item = GenericPredicate> + 'a {
479 let last_segment = match bound {
480 TypeBound::Path(path) => path.segments.last(),
481 TypeBound::Error => None,
482 };
483 last_segment
484 .into_iter()
485 .flat_map(|segment| segment.args_and_bindings.iter())
486 .flat_map(|args_and_bindings| args_and_bindings.bindings.iter())
487 .map(move |(name, type_ref)| {
488 let associated_ty =
489 associated_type_by_name_including_super_traits(db, trait_ref.trait_, &name);
490 let associated_ty = match associated_ty {
491 None => return GenericPredicate::Error,
492 Some(t) => t,
493 };
494 let projection_ty =
495 ProjectionTy { associated_ty, parameters: trait_ref.substs.clone() };
496 let ty = Ty::from_hir(db, resolver, type_ref);
497 let projection_predicate = ProjectionPredicate { projection_ty, ty };
498 GenericPredicate::Projection(projection_predicate)
499 })
500}
501
502/// Build the signature of a callable item (function, struct or enum variant).
503pub(crate) fn callable_item_sig(db: &impl HirDatabase, def: CallableDef) -> FnSig {
504 match def {
505 CallableDef::FunctionId(f) => fn_sig_for_fn(db, f),
506 CallableDef::StructId(s) => fn_sig_for_struct_constructor(db, s),
507 CallableDef::EnumVariantId(e) => fn_sig_for_enum_variant_constructor(db, e),
508 }
509}
510
511/// Build the type of all specific fields of a struct or enum variant.
512pub(crate) fn field_types_query(
513 db: &impl HirDatabase,
514 variant_id: VariantId,
515) -> Arc<ArenaMap<LocalStructFieldId, Ty>> {
516 let var_data = variant_data(db, variant_id);
517 let resolver = match variant_id {
518 VariantId::StructId(it) => it.resolver(db),
519 VariantId::UnionId(it) => it.resolver(db),
520 VariantId::EnumVariantId(it) => it.parent.resolver(db),
521 };
522 let mut res = ArenaMap::default();
523 for (field_id, field_data) in var_data.fields().iter() {
524 res.insert(field_id, Ty::from_hir(db, &resolver, &field_data.type_ref))
525 }
526 Arc::new(res)
527}
528
529/// This query exists only to be used when resolving short-hand associated types
530/// like `T::Item`.
531///
532/// See the analogous query in rustc and its comment:
533/// https://github.com/rust-lang/rust/blob/9150f844e2624eb013ec78ca08c1d416e6644026/src/librustc_typeck/astconv.rs#L46
534/// This is a query mostly to handle cycles somewhat gracefully; e.g. the
535/// following bounds are disallowed: `T: Foo<U::Item>, U: Foo<T::Item>`, but
536/// these are fine: `T: Foo<U::Item>, U: Foo<()>`.
537pub(crate) fn generic_predicates_for_param_query(
538 db: &impl HirDatabase,
539 def: GenericDefId,
540 param_idx: u32,
541) -> Arc<[GenericPredicate]> {
542 let resolver = def.resolver(db);
543 resolver
544 .where_predicates_in_scope()
545 // we have to filter out all other predicates *first*, before attempting to lower them
546 .filter(|pred| Ty::from_hir_only_param(db, &resolver, &pred.type_ref) == Some(param_idx))
547 .flat_map(|pred| GenericPredicate::from_where_predicate(db, &resolver, pred))
548 .collect()
549}
550
551impl TraitEnvironment {
552 pub(crate) fn lower(db: &impl HirDatabase, resolver: &Resolver) -> Arc<TraitEnvironment> {
553 let predicates = resolver
554 .where_predicates_in_scope()
555 .flat_map(|pred| GenericPredicate::from_where_predicate(db, &resolver, pred))
556 .collect::<Vec<_>>();
557
558 Arc::new(TraitEnvironment { predicates })
559 }
560}
561
562/// Resolve the where clause(s) of an item with generics.
563pub(crate) fn generic_predicates_query(
564 db: &impl HirDatabase,
565 def: GenericDefId,
566) -> Arc<[GenericPredicate]> {
567 let resolver = def.resolver(db);
568 resolver
569 .where_predicates_in_scope()
570 .flat_map(|pred| GenericPredicate::from_where_predicate(db, &resolver, pred))
571 .collect()
572}
573
574/// Resolve the default type params from generics
575pub(crate) fn generic_defaults_query(db: &impl HirDatabase, def: GenericDefId) -> Substs {
576 let resolver = def.resolver(db);
577 let generic_params = db.generic_params(def.into());
578
579 let defaults = generic_params
580 .params_including_parent()
581 .into_iter()
582 .map(|p| p.default.as_ref().map_or(Ty::Unknown, |t| Ty::from_hir(db, &resolver, t)))
583 .collect();
584
585 Substs(defaults)
586}
587
588fn fn_sig_for_fn(db: &impl HirDatabase, def: FunctionId) -> FnSig {
589 let data = db.function_data(def);
590 let resolver = def.resolver(db);
591 let params = data.params.iter().map(|tr| Ty::from_hir(db, &resolver, tr)).collect::<Vec<_>>();
592 let ret = Ty::from_hir(db, &resolver, &data.ret_type);
593 FnSig::from_params_and_return(params, ret)
594}
595
596/// Build the declared type of a function. This should not need to look at the
597/// function body.
598fn type_for_fn(db: &impl HirDatabase, def: FunctionId) -> Ty {
599 let generics = db.generic_params(def.into());
600 let substs = Substs::identity(&generics);
601 Ty::apply(TypeCtor::FnDef(def.into()), substs)
602}
603
604/// Build the declared type of a const.
605fn type_for_const(db: &impl HirDatabase, def: ConstId) -> Ty {
606 let data = db.const_data(def);
607 let resolver = def.resolver(db);
608
609 Ty::from_hir(db, &resolver, &data.type_ref)
610}
611
612/// Build the declared type of a static.
613fn type_for_static(db: &impl HirDatabase, def: StaticId) -> Ty {
614 let data = db.static_data(def);
615 let resolver = def.resolver(db);
616
617 Ty::from_hir(db, &resolver, &data.type_ref)
618}
619
620/// Build the declared type of a static.
621fn type_for_builtin(def: BuiltinType) -> Ty {
622 Ty::simple(match def {
623 BuiltinType::Char => TypeCtor::Char,
624 BuiltinType::Bool => TypeCtor::Bool,
625 BuiltinType::Str => TypeCtor::Str,
626 BuiltinType::Int(t) => TypeCtor::Int(IntTy::from(t).into()),
627 BuiltinType::Float(t) => TypeCtor::Float(FloatTy::from(t).into()),
628 })
629}
630
631fn fn_sig_for_struct_constructor(db: &impl HirDatabase, def: StructId) -> FnSig {
632 let struct_data = db.struct_data(def.into());
633 let fields = struct_data.variant_data.fields();
634 let resolver = def.resolver(db);
635 let params = fields
636 .iter()
637 .map(|(_, field)| Ty::from_hir(db, &resolver, &field.type_ref))
638 .collect::<Vec<_>>();
639 let ret = type_for_adt(db, def.into());
640 FnSig::from_params_and_return(params, ret)
641}
642
643/// Build the type of a tuple struct constructor.
644fn type_for_struct_constructor(db: &impl HirDatabase, def: StructId) -> Ty {
645 let struct_data = db.struct_data(def.into());
646 if struct_data.variant_data.is_unit() {
647 return type_for_adt(db, def.into()); // Unit struct
648 }
649 let generics = db.generic_params(def.into());
650 let substs = Substs::identity(&generics);
651 Ty::apply(TypeCtor::FnDef(def.into()), substs)
652}
653
654fn fn_sig_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariantId) -> FnSig {
655 let enum_data = db.enum_data(def.parent);
656 let var_data = &enum_data.variants[def.local_id];
657 let fields = var_data.variant_data.fields();
658 let resolver = def.parent.resolver(db);
659 let params = fields
660 .iter()
661 .map(|(_, field)| Ty::from_hir(db, &resolver, &field.type_ref))
662 .collect::<Vec<_>>();
663 let generics = db.generic_params(def.parent.into());
664 let substs = Substs::identity(&generics);
665 let ret = type_for_adt(db, def.parent.into()).subst(&substs);
666 FnSig::from_params_and_return(params, ret)
667}
668
669/// Build the type of a tuple enum variant constructor.
670fn type_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariantId) -> Ty {
671 let enum_data = db.enum_data(def.parent);
672 let var_data = &enum_data.variants[def.local_id].variant_data;
673 if var_data.is_unit() {
674 return type_for_adt(db, def.parent.into()); // Unit variant
675 }
676 let generics = db.generic_params(def.parent.into());
677 let substs = Substs::identity(&generics);
678 Ty::apply(TypeCtor::FnDef(EnumVariantId::from(def).into()), substs)
679}
680
681fn type_for_adt(db: &impl HirDatabase, adt: AdtId) -> Ty {
682 let generics = db.generic_params(adt.into());
683 Ty::apply(TypeCtor::Adt(adt), Substs::identity(&generics))
684}
685
686fn type_for_type_alias(db: &impl HirDatabase, t: TypeAliasId) -> Ty {
687 let generics = db.generic_params(t.into());
688 let resolver = t.resolver(db);
689 let type_ref = &db.type_alias_data(t).type_ref;
690 let substs = Substs::identity(&generics);
691 let inner = Ty::from_hir(db, &resolver, type_ref.as_ref().unwrap_or(&TypeRef::Error));
692 inner.subst(&substs)
693}
694
695#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
696pub enum CallableDef {
697 FunctionId(FunctionId),
698 StructId(StructId),
699 EnumVariantId(EnumVariantId),
700}
701impl_froms!(CallableDef: FunctionId, StructId, EnumVariantId);
702
703impl CallableDef {
704 pub fn krate(self, db: &impl HirDatabase) -> CrateId {
705 match self {
706 CallableDef::FunctionId(f) => f.lookup(db).module(db).krate,
707 CallableDef::StructId(s) => s.module(db).krate,
708 CallableDef::EnumVariantId(e) => e.parent.module(db).krate,
709 }
710 }
711}
712
713impl From<CallableDef> for GenericDefId {
714 fn from(def: CallableDef) -> GenericDefId {
715 match def {
716 CallableDef::FunctionId(f) => f.into(),
717 CallableDef::StructId(s) => s.into(),
718 CallableDef::EnumVariantId(e) => e.into(),
719 }
720 }
721}
722
723#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
724pub enum TyDefId {
725 BuiltinType(BuiltinType),
726 AdtId(AdtId),
727 TypeAliasId(TypeAliasId),
728}
729impl_froms!(TyDefId: BuiltinType, AdtId(StructId, EnumId, UnionId), TypeAliasId);
730
731#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
732pub enum ValueTyDefId {
733 FunctionId(FunctionId),
734 StructId(StructId),
735 EnumVariantId(EnumVariantId),
736 ConstId(ConstId),
737 StaticId(StaticId),
738}
739impl_froms!(ValueTyDefId: FunctionId, StructId, EnumVariantId, ConstId, StaticId);
740
741/// Build the declared type of an item. This depends on the namespace; e.g. for
742/// `struct Foo(usize)`, we have two types: The type of the struct itself, and
743/// the constructor function `(usize) -> Foo` which lives in the values
744/// namespace.
745pub(crate) fn ty_query(db: &impl HirDatabase, def: TyDefId) -> Ty {
746 match def {
747 TyDefId::BuiltinType(it) => type_for_builtin(it),
748 TyDefId::AdtId(it) => type_for_adt(db, it),
749 TyDefId::TypeAliasId(it) => type_for_type_alias(db, it),
750 }
751}
752pub(crate) fn value_ty_query(db: &impl HirDatabase, def: ValueTyDefId) -> Ty {
753 match def {
754 ValueTyDefId::FunctionId(it) => type_for_fn(db, it),
755 ValueTyDefId::StructId(it) => type_for_struct_constructor(db, it),
756 ValueTyDefId::EnumVariantId(it) => type_for_enum_variant_constructor(db, it),
757 ValueTyDefId::ConstId(it) => type_for_const(db, it),
758 ValueTyDefId::StaticId(it) => type_for_static(db, it),
759 }
760}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-23 09:45:46 +0100